This document provides a guide for organizing an open data hackathon. It discusses why hackathons are useful for increasing awareness of open data and solving problems. The guide covers all aspects of planning a hackathon, including assembling a team, choosing dates/venues, securing sponsors, promotion, preparing materials, and running the event. Key steps include preparing the space with adequate internet, power, and work areas before participants arrive. The overall goal is to create a focused, well-supported environment for collaboratively developing new applications and insights using open data.